/*
 * TouchGestureDetector.java
 * Android-Charts
 *
 * Created by limc on 2014.
 *
 * Copyright 2011 limc.cn All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package cn.limc.ohoscharts.event;


import ohos.agp.utils.Point;
import ohos.multimodalinput.event.MmiPoint;
import ohos.multimodalinput.event.TouchEvent;

/**
 * <p>en</p>
 * <p>jp</p>
 * <p>cn</p>
 *
 * @author limc
 * @version v1.0 2014/06/23 16:37:37
 */
public class TouchGestureDetector<T extends ITouchable> implements IGestureDetector {

  protected Point touchPoint;
  static final int TOUCH_MOVE_MIN_DISTANCE = 6;

  protected T instance;
  protected OnTouchGestureListener onTouchGestureListener;

  /**
   * <p>Constructor of TouchGestureDetector</p>
   * <p>TouchGestureDetector类对象的构造函数</p>
   * <p>TouchGestureDetectorのコンストラクター</p>
   */
  public TouchGestureDetector(T touchable) {
    instance = touchable;
    if (touchable != null) {
      this.onTouchGestureListener = touchable.getOnTouchGestureListener();
    }
  }

  /**
   * <p>Constructor of TouchGestureDetector</p>
   * <p>TouchGestureDetector类对象的构造函数</p>
   * <p>TouchGestureDetectorのコンストラクター</p>
   *
   * @param touchListener
   */
  public TouchGestureDetector(OnTouchGestureListener touchListener) {
    super();
    this.onTouchGestureListener = touchListener;
  }


  /**
   * @return the onTouchGestureListener
   */
  public OnTouchGestureListener getOnTouchGestureListener() {
    return onTouchGestureListener;
  }

  /**
   * @param onTouchGestureListener the onTouchGestureListener to set
   */
  public void setOnTouchGestureListener(
      OnTouchGestureListener onTouchGestureListener) {
    this.onTouchGestureListener = onTouchGestureListener;
  }

  @Override
  public boolean onTouchEvent(TouchEvent event) {
    MmiPoint point = event.getPointerPosition(event.getIndex());
    switch (event.getAction()) {
      case TouchEvent.PRIMARY_POINT_DOWN:
        if (event.getPointerCount() == 1) {
          touchPoint = new Point(point.getX(), point.getY());
          if (onTouchGestureListener != null) {
            onTouchGestureListener.onTouchDown(instance, event);
          }
        }
        break;
      case TouchEvent.PRIMARY_POINT_UP:
        if (event.getPointerCount() == 1) {
          touchPoint = new Point(point.getX(), point.getY());
          if (onTouchGestureListener != null) {
            onTouchGestureListener.onTouchUp(instance, event);
          }
        }
        break;
      case TouchEvent.OTHER_POINT_UP:
        break;
      case TouchEvent.OTHER_POINT_DOWN:
        break;
      case TouchEvent.POINT_MOVE:
        // single touch point moved
        if (event.getPointerCount() == 1) {
          float moveXdistance = Math.abs(point.getX() - touchPoint.getPointX());
          float moveYdistance = Math.abs(point.getY() - touchPoint.getPointY());
          if (moveXdistance > TOUCH_MOVE_MIN_DISTANCE ||
              moveYdistance > TOUCH_MOVE_MIN_DISTANCE) {
            //reset touchPoint
            touchPoint = new Point(point.getX(), point.getY());
            // call back to listener
            if (onTouchGestureListener != null) {
              onTouchGestureListener.onTouchMoved(instance, event);
            }
          }
        }
        break;
    }
    return true;
  }
}
